Method of manufacturing stent attached to artificial blood vessel and stent attached to artificial blood vessel manufactured by the same

Abstract

A stent may be inserted and placed in a lesion portion that is being stenosed or has been stenosed in a blood vessel or a lumen in the body to expand the lesion portion that is being stenosed or has been stenosed. Further, the stent and the artificial blood vessel layers are integrally formed with each other without floating between the stent and the artificial blood vessel layers. Accordingly, foods or other contents travelling through the pathway of a lumen in the body or blood in the vessel may be prevented from contacting the lesion portion, and the progress of the stenosis of the lesion portion may be prevented that may occur as the lesion portion grows toward the inside of the hollow cylindrical body of the stent.

What is claimed is: 
     
         1 . A method of manufacturing an artificial blood vessel-attached stent, the method comprising:
 forming a stent having a hollow cylindrical body by crossingly weaving a superelastic shape memory alloy wire;   performing attachment preparation by forming an inner artificial blood vessel layer by inclinedly winding an artificial blood vessel (PTFE: Polytetrafluoroethylene) along an outer side of a SUS rod to form an inner artificial blood vessel layer, inserting the inner artificial blood vessel layer into the stent, inclinedly winding an artificial blood vessel (PTFE; Polytetrafluoroethylene) along an outer side of the stent to form an outer artificial blood vessel layer, and inserting a silicone tube; and   fixedly mounting the SUS rod inside a vacuum heating device, attaching the inner artificial blood vessel layer and the outer artificial blood vessel layer positioned at the inside and outside of the stent to each other by a vacuuming operation towards the stent with the inner artificial blood vessel layer and the outer artificial blood vessel layer internally and externally wrapping around the stent, and thermally fusing the inner artificial blood vessel layer and the outer artificial blood vessel layer to each other by a heating operation so that the inner artificial blood vessel layer and outer artificial blood vessel layer are integrally attached to the stent.   
     
     
         2 . The method of  claim 1 , wherein the heating operation of the vacuum heating device is performed by a heater provided inside the SUS rod. 
     
     
         3 . A artificial blood vessel-attached stent comprising an artificial blood vessel layer at an outside of a hollow cylindrical body formed by crossingly weaving a superelastic shape memory alloy wire, wherein the artificial blood vessel layer is formed by thermally fusing an inner artificial blood vessel layer and an outer artificial blood vessel layer respectively positioned at an inside and outside of the hollow cylindrical body of the stent, with the inner artificial blood vessel layer and the outer artificial blood vessel layer attached with each other while internally and externally wrapping around the hollow cylindrical body. 
     
     
         4 . A method of manufacturing an artificial blood vessel-attached stent, the method comprising:
 forming a stent by forming a dense stent having a hollow cylindrical body by crossingly weaving a superelastic shape memory alloy wire to have a narrow interval, forming a sparse stent having a hollow cylindrical body by crossingly weaving the superelastic shape memory alloy wire from an end of the dense stent to have a broad interval, and forming an extension stent having a trumpet-shaped body to weaving the superelastic shape memory alloy wire from another end of the dense stent and coupling the extension stent to the other end of the dense stent;   performing attachment preparation by forming an inner artificial blood vessel layer by inclinedly winding an artificial blood vessel (PTFE; Polytetrafluoroethylene) along an outer side of a SUS rod to form an inner artificial blood vessel layer, inserting the inner artificial blood vessel layer into the dense stent and the sparse stent, inclinedly winding an artificial blood vessel (PTFE; Polytetrafluoroethylene) along an outer side of the dense stent and the sparse stent to form an outer artificial blood vessel layer, and inserting a silicone tube; and   fixedly mounting the SUS rod inside a vacuum heating device, attaching the inner artificial blood vessel layer and the outer artificial blood vessel layer positioned at the inside and outside of the dense stent and the sparse stent to each other by a vacuuming operation towards the dense stent and the sparse stent with the inner artificial blood vessel layer and the outer artificial blood vessel layer internally and externally wrapping around the dense stent and the sparse stent, and thermally fusing the inner artificial blood vessel layer and the outer artificial blood vessel layer to each other by a heating operation so that the inner artificial blood vessel layer and outer artificial blood vessel layer are integrally attached to the dense stent and the sparse stent.   
     
     
         5 . The method of  claim 4 , wherein the heating operation of the vacuum heating device is performed by a heater provided inside the SUS rod. 
     
     
         6 . A artificial blood vessel-attached stent comprising a hollow cylindrical body including a dense stent formed by weaving a superelastic shape memory alloy wire at a narrow interval in a portion thereof, a sparse stent formed by weaving the superelastic shape memory alloy wire from a side of the dense stent at a broad interval and a trumpet-shaped extension stent coupled with an end of the dense stent, wherein an artificial blood vessel layer is formed at an outside of the hollow cylindrical body, and wherein the artificial blood vessel layer is formed by thermally fusing an inner artificial blood vessel layer and an outer artificial blood vessel layer respectively positioned at an inside and outside of the hollow cylindrical body of the stent, with the inner artificial blood vessel layer and the outer artificial blood vessel layer attached with each other while internally and externally wrapping around the hollow cylindrical body.